Casing



FIG. 1 is a perspective view of the casing showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a Left side view thereof;

FIG. 5 is a Right side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof. 

CLAIM The ornamental design for a casing, as shown and described. 